Abstract
In order to guarantee the safety of the gas production plants, Air Liquide conducts NDT inspections regularly closely following the assets’ maintenance plans. One high criticality asset is the Pressure Swing Adsorber (PSA), found in the last stages of the hydrogen production process, where product purification takes place. These adsorbers are pressure vessels and need to be inspected for hydrogen enhanced fatigue cracks. The PSA adsorbers are inspected for cracks regularly by INTACT following a dedicated inspection plan. When indications or cracks are found, a Fitness For Service (FFS) assessment is done to determine the stability of the crack, and if stable, propagate the crack over time calculating the number of cycles before the crack reaches its critical size, in other words, the time up until this crack will go through the complete thickness of the adsorber creating a leak. As an output of the FFS assessment, certain cracks could require a close monitoring, with high frequency intervals of inspection, this necessity is what drove Air Liquide R&D and INTACT to partner up to develop the “Ultrasonic connected probe for in-service monitoring of pressure equipment”.
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